Function FileTimeSecondsUntil

source/util.cpp:298–313

__int64 FileTimeSecondsUntil(FILETIME *pftStart, FILETIME *pftEnd)
// Returns the number of seconds from pftStart until pftEnd.
{
	if (!pftStart || !pftEnd) return 0;

	// The calculation is done this way for compilers that don't support 64-bit math operations (not sure which):
	// Note: This must be LARGE vs. ULARGE because we want the calculation to be signed for cases where
	// pftStart is greater than pftEnd:
	ULARGE_INTEGER uiStart, uiEnd;
	uiStart.LowPart = pftStart->dwLowDateTime;
	uiStart.HighPart = pftStart->dwHighDateTime;
	uiEnd.LowPart = pftEnd->dwLowDateTime;
	uiEnd.HighPart = pftEnd->dwHighDateTime;
	// Must do at least the inner cast to avoid losing negative results:
	return (__int64)((__int64)(uiEnd.QuadPart - uiStart.QuadPart) / 10000000); // Convert from tenths-of-microsecond.
}